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Top 50 dns Interview Questions

The most frequently asked dns questions across all roles and companies, ranked by real interview frequency. Updated daily.

50questions
~7htotal time
44companies covered
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1
Security & InfrastructureStart here. 25 questions · ~200 min
DDoS Attack: DNS and AmplificationHard

Explain DNS amplification, why UDP enables it, and how to detect and mitigate the attack.

Networkingnetwork securitydnsAdobe
DNS Resolution Failure PointsHard

Explain DNS resolution and diagnose spoofing, latency, split-horizon, and availability failures affecting MongoDB cloud workloads.

Networkingcloud environmentnetwork securityMongoDB
DDoS Defense for Global CDNHard

Design a Meta CDN architecture that detects volumetric, protocol, and application-layer DDoS attacks while preserving legitimate traffic.

InfrastructureNetworkingnetwork securityMeta
Networking Checks for Database AccessHard

Use layered network diagnostics to isolate DNS, routing, transport, firewall, TLS, and authentication failures safely.

Networkingnetwork securitydnsSalesforce
DNS Lookup Under The HoodMedium
Recently asked

Assesses your understanding of DNS resolution flow for troubleshooting connectivity issues.

NetworkingdnsNokia
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2
Execution3 questions · ~24 min
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3
Technical Fundamentals12 questions · ~96 min
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4
Pipelines3 questions · ~24 min
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5
More topics7 questions · ~56 min
Explaining a DNS Incident End-to-EndMedium

Tests ownership and communication under ambiguity by asking for a real example of explaining a DNS incident end-to-end and driving action.

Networkingdnstechnical knowledgePalantir technologiesGoogle
Explaining DNS Risk to ExecutivesMedium
Recently asked

Tests technical communication, ownership, and leadership under ambiguity when translating a complex security concept into customer action.

network securitydnstechnical experiencePalo Alto Networks
DNS BasicsMedium

Explain how DNS translates domain names into IP addresses and why Cloudflare DNS improves reliability, performance, and security.

User Needstechnical usersdnsCloudflare
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